Question

the cost of 2 pencils and 3 erasers is rupees 9 and the cost of 4 pencils and 6 eraser is rupees 18. Find the cost of each pencil and each eraser by the method of substitution​

Answer 1

Answer:

Let the cost of one pencil =Rs x

and cost of one eraser =Rs y

According to the question

2x+3y=9 ...(1)

4x+6y=18

⇒2(2x+3y)=18

⇒2x+3y=9...(2)

As we can see from Eq. (1) and (2)

⇒

a1/a2=b1/b2=c1/c2

∴ Given pair of linear equations has indefinitely many solutions. mark it as branlist